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Article

Assessing the Use of Dual-Drainage Modeling to Determine the Effects of Green Stormwater Infrastructure on Roadway Flooding and Traffic Performance

1
Department of Civil and Environmental Engineering, Colorado State University, Fort Collins, CO 80523, USA
2
Wright Water Engineers, Denver, CO 80211, USA
*
Author to whom correspondence should be addressed.
Academic Editors: John McCray and Skuyler Herzog
Water 2021, 13(11), 1563; https://doi.org/10.3390/w13111563
Received: 16 April 2021 / Revised: 20 May 2021 / Accepted: 26 May 2021 / Published: 31 May 2021
Green stormwater infrastructure (GSI) is increasingly used to reduce stormwater input to the subsurface stormwater network. This work investigated how GSI interacts with surface runoff and stormwater structures to affect the spatial extent and distribution of roadway flooding and subsequent effects on the performance of the traffic system using a dual-drainage model. The model simulated roadway flooding using PCSWMM (Personal Computer Stormwater Management Model) in Harvard Gulch, Denver, Colorado, and was then used in a microscopic traffic simulation using the Simulation of Urban Mobility Model (SUMO). We examined the effect of converting between 1% and 5% of directly connected impervious area (DCIA) to bioretention GSI on roadway flooding. The results showed that even for 1% of DCIA converted to GSI, the extent and mean depth of roadway flooding was reduced. Increasing GSI conversion further reduced roadway flooding depth and extent, although with diminishing returns per additional percentage of DCIA converted to GSI. Reduced roadway flooding led to increased average vehicle speeds and decreased percentage of roads impacted by flooding and total travel time. We found diminishing returns in the roadway flooding reduction per additional percentage of DCIA converted to GSI. Future work will be conducted to reduce the main limitations of insufficient data for model validation. Detailed dual-drainage modeling has the potential to better predict what GSI strategies will mitigate roadway flooding. View Full-Text
Keywords: stormwater management; street flooding; transportation network; travel time stormwater management; street flooding; transportation network; travel time
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MDPI and ACS Style

Knight, K.L.; Hou, G.; Bhaskar, A.S.; Chen, S. Assessing the Use of Dual-Drainage Modeling to Determine the Effects of Green Stormwater Infrastructure on Roadway Flooding and Traffic Performance. Water 2021, 13, 1563. https://doi.org/10.3390/w13111563

AMA Style

Knight KL, Hou G, Bhaskar AS, Chen S. Assessing the Use of Dual-Drainage Modeling to Determine the Effects of Green Stormwater Infrastructure on Roadway Flooding and Traffic Performance. Water. 2021; 13(11):1563. https://doi.org/10.3390/w13111563

Chicago/Turabian Style

Knight, Kathryn L., Guangyang Hou, Aditi S. Bhaskar, and Suren Chen. 2021. "Assessing the Use of Dual-Drainage Modeling to Determine the Effects of Green Stormwater Infrastructure on Roadway Flooding and Traffic Performance" Water 13, no. 11: 1563. https://doi.org/10.3390/w13111563

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